I've had a dig through the forums and I don't think anyone's suggested this so:

I think a great feature would be to have detailed information on creatures and mobs that you encounter in the game. This could be done through a separate tab in the craft book. When you first spot a new creature, its thumbnail and name could be added to the book, however, if you kill the mob, doing so could add detailed information on its behaviour, stats, what weapons are effective against them, and items it can drop if you defeat one.

This could help a lot of players with figuring out the most effective way of combating said mob , as well as aiding in tracking down the components you require to craft that next sword or piece of armor.